I made a payment but they have deducted from me

On the 18th Dec I made a eff payment and sent my proof of payment through to the collections department. On the Monday the 21st Dec wonga deducted from my account. I called in to advise that they need to reverse the payment asap. I called in again the Tuesday and Wednesday and I was advised it takes 24 to 48 hours to reverse. It is the 28th December and I still haven't received my money back . I sent a e-mail as well and didn't get any response. What should I do in this case as it has been more than 48 hours already.